Tom Watson MP joins us to discuss the government opening up its spending data through the Coins database. As a key figure for open data in the last administration, he details some of the pitfalls and problems he had. We also look at Apple's new iPhone 4

Crime, education, health – over the coming weeks, we will be able to access previously unseen data covering every aspects of our lives. This throws up huge possibilities, and challenges, for journalists. By Simon Rogers